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김화평,인수일 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
A microbial electrolysis cell (MEC) consumes the chemical energy of organic material producing, in turn, hydrogen. This study presents a new hybrid MEC design with improved performance. An external TiO<sub>2</sub> nanotube (TNT) array photoanode, fabricated by anodization of Ti foil, supplies photogenerated electrons to the MEC electrical circuit, significantly improving overall performance. The photogenerated electrons help to reduce electron depletion of the bioanode, and improve the proton reduction reaction at the cathode. Under simulated AM 1.5 illumination (100 mW cm<sup>-2</sup>) the 28 mL hybrid MEC exhibits a H<sub>2</sub> evolution rate of 1434.268 ± 114.174 mmol m<sup>-3</sup> h<sup>-1</sup>, a current density of 0.371 ± 0.000 mA cm<sup>-2</sup> and power density of 1415.311 ± 23.937 mW m<sup>-2</sup>, that are respectively 30.76%, 34.4%, and 26.0% higher than a MEC under dark condition.
김화평,공태영,김성준,손진호,최우석,송창순,김희근 (사)한국방사선산업학회 2022 방사선산업학회지 Vol.16 No.3
Currently, the number of permanently shut down nuclear power reactors is increasingworldwide. Kori Unit 1 and Wolsong Unit 1 were permanently shut down in Korea. Considering thedecommissioning of Korean nuclear power plants, establishing a safety evaluation methodologyis essential because safety evaluation is a critical factor in the decommissioning plan. The safetyassessment of decommissioning facilities involves evaluating all aspects of the field, design, andoperation concerning the protection and safety of workers, the surrounding environment, and the generalpublic. The safety assessment method for decommissioning aims to keep residual risks as low asreasonably achievable by identifying methods for radiation dose reduction and assessing potential doses. In terms of safety assessment criteria, guidance from the International Atomic Energy Agency (IAEA)provides several criteria, including a safety assessment system, facility and decommissioning activities,risk analysis (identification and screening), risk factor analysis (evaluation), engineering assessment, andsafety measures. The Korea Institute of Nuclear Safety (KINS), a Korean regulatory expert organization,also provides safety review guidelines for the approval of the final decommissioning plan (FDP) fornuclear facilities, including safety assessment factors: principles and standards, exposure scenarios,dose assessment, residual radioactivity, abnormal events, and hazards. The Korea Hydro & NuclearPower (KHNP), the nuclear licensee in Korea, submitted the FDP of Kori Unit 1 to the nuclear regulatorybody, which uses the above-mentioned safety assessment factors. This paper compares and analyzesthe safety assessment criteria provided by the IAEA, KINS, and KHNP to ensure the safety of workers, theenvironment, and the general public during the decommissioning of nuclear power reactors.
Photo-coupled Bio-anode: A New Approach for Improved Microbial Fuel Cell Performance
김화평,인수일 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Microbial fuel cells (MFCs) received considerable attention because of their ability to provide dual advantages of electricity generation and wastewater treatment. However, their performance is primarily limited by the slow oxygen reduction reaction (ORR). To alleviate this problem, we describe a hybrid MFC in which a conventional bioanode is coupled with a TiO<sub>2</sub> photoanode. The photocatalytic photoanode utilizes light to provide additional photogenerated electrons to the external circuit of the MFC, which promotes the ORR, as confirmed by power density curves and electrochemical impedance spectra, resulting in improved power generation (1284±20 mW m<sup>-2</sup>) compared to that of a normal MFC (850±12 mW m<sup>-2</sup>). Furthermore, the ability of the TiO<sub>2</sub> photoanode to reduce CO<sub>2</sub> to methane is demonstrated.